Does anybody know a source of glassine seed envelopes where I don't have to order hundreds?
clearbags.com has them in many sizes and at a very low price (50 for less than $3) I've also seen them at Michael's but you'll pay more.
I use the paper coin envelopes from Staples. You can't see through them but they're inexpensive and work well for me. I print address labels to attach to them, but you can also write directly on them.